Seems reasonable if you ask me. Why should anybody care if my adult sibling and I want to have sex or I want to marry more than one person, as long as I'm financially capable of supporting such a union and therefore would not burden the state then it should be solely my business.

Details: The age is minimum 16 for a minor (<18) with a major more than 20 years old. Under 18, the younger must not be less than 14, or if so, there is a defense if the minor is not more 4 years younger if above 12, not more 3 years younger if under 12. Sexual intercourse of a major and a minor under 14 is a rape.

Like i'd really wanna consult with anyone in that state about immoral behaivior